Internal-combustion engine



Jan. 1, 1929. 1,697,553

E. R. BURTNETT I INTERNAL COMBUSTION ENGINE Filed Jan. l2, 1925 S Sheets-Sheet 1 Q3 NP.

A \g m g Q j R fz' iif aikzezz Jan. 1, 1929.

E. R. BURTNETT INTERNAL COMBUSTION ENGINE Filed Jan. 12, 1925 3 Sheets-Sheet z 3' Jz/erg% Jan. I, 1929.

. E. R. BURTNETT INTERNAL COMBUSTION ENGINE Filed Jan. 12, 1925 3 Sheets-Sheet 0 I I l I I I I I u I 0 Patented Jan. 1, 1929.

EVERETT R. BURTNETT, or Los ANGELES, oALrroRn IA, assrenoia, BY nIREor Ann MEsNE ASSIGNMENTS, TO THE AU'ror/rorIvEvALvEs 00., or LOS ANGELES, CALL IE'ORNIA, AhVOLUNTAB-Y'TRUST.

r INTERNAL-COMBUSTION ENGINE.

Application filed January 12, 1925. Serial No. 1,848.

My invention relates to internal combustion engines and has for its principal objects, theprovision of a relatively simple, strong, rugged and efficient two stroke cycle internal combustion engine, "wherein six cylinders are arranged to form three units that'combine and function for the output-of power, three of the six pistons that operate within the six cylinders being of one form and weight, the. other three pistons beingof a different formand weight; to arrange the cylinders and pistons in three pairs, a set of pistons of different size and weight, the two pistons constituting each pair being separately connected to one throw of a three throw crank shaft and, further, to arrangethe three throws of the crank shaft 120 apart so as to provide reciprocatory and rotary balance.

Further objects of myinvention are to provide an improved two stroke cycle internal combustion engine whereln three un1ts of each function are employed; to provide an posed immediately adjacenttoeach otherend forming one of the three pairsrof cylinders of the engine; to connect'the head ends of the members of each pair of cylinder chambers by a common compression and combustionclea-rance chamber; to provide four main bearings for the three throw crank shaft with I one throw between each pair of 'main bear- 40 bearing peripheries and to arrange centrally, on each throw and between the bearing pe ripheries thereon, a counter balancing weight 1 that ispositioned so that it projects diamctrically opposite to the radialplane occupied by thecrank to which it is connected. I i .1

j Further objects of my invention are to pro vide three 'piston valves for controlling the admission of gaseous fuel to'the larger di,-' ameter chambers of the cylinders having the'two' diameterchambers and pistons;-t'oi ings; to provide ea'chof the three throws of V the crank shaft with two connecting rod l arrange said pistonvalves with their axes centered in arow or plane that is parallel with the plane occupiedby theaxes of the engine cylinders ,to actuate'said piston valves from an auxiliary or eccentric shaft that is driven posltivel-y from and at the samespeed wlth the engine crank shaft; to provide the engine with a detachable cylinder head block," in which is formed the three common com-1 pression and combustion clearance chambers that connect the head ends of therespective members of the'three pairs ofcombustion chambers; to arrange ignition meansin each clearance chamber in said head and further, to form in the engine cylinders, inlet'and exhaust ports that are located so asto bring about the maximum degree'of efficiency of engine'op'eration and power output. I

Withthe foregoing and other objects in view, my invention consists in certain novel, 7

features'of construction and arrangement of parts that will be hereinaftermore fully de-. scribed and claimed and illustratedi'n the accompanying drawings in which: a

Fig. 1 isa vertical section taken lengthwise through the center of. an engine constructed in accordance with my inventionf v Fig. 2 is a diagrammatic view that graphi cally illustrates theYrel'ative angular positions of thecrank throws of'thecrankshaft.

' Fig. 3 is an enlarged vertical section taken a Y i I approximately on the line 3 3 of Fig.1.

Fig. 4 is a horizontal section taken app'roxi-Q mately on the lined-+4: of Fig. 1.

Fig. 5 is a horizontal sectiontaken approximately on the line 55 of Fig. 1. Referr ng by numerals to the accompanymg drawmgs, 1O designates a cylinder block,

preferably castin a single piece and within I which areformed six bores, 11, 12,13, 14:, 15

and 16, thatfunction as combustion chani-r bers. --The axes of these chambers are parale lel and they are arranged in row, that is,

said axes alloccupythe same plane.

The diameters of bores or chamb rs-11, 13 I and 15 are straight, or uniformthroughout their lengths, while the alternate .bores'or;

chambers 12,14- and 16, have their lower por tions increased in diameter to form gaseous. fuelpumpingchambers 17, 18 and 1-9 respectively.

loo

Secured .in position i head; of

' block 10 is ahead block 20, in the underside of which is formed three chambers 21, 22 and 23. b j

Chamber 21 is located sothat it connects and provides a common compression and combustion clearance for combustion chambers 11 and-'12 and in similar fashion, cham- 'ber 22 connects and provides a common cleari connects and provides a common compression ance'for combustion chambers 13 and 14:. The third chamber 23 is located so that it and'combustion clearance for combustion chambersl and 16.

Head 20 is preferably formed with connected cells orchambers 24:,that may be connected in any suitable manner with cells or chambers. 25, that-are formed in the upper portions of thewalls of cylinder block and i weights are d'isposed'120 V entially.=

' The lo'wer'portions pistons 12,*14and 16 are provided with en-' which cellsare fortheaccommodation of a circulating cooling fluid medium, such} as piston valves,

water; a Seated in head 20 andprojecting into the common clearance-chambers 2,1, 22 and 23 are" ignitiondevices, such asspark plugs 26,'there being, preferably, two plugs to each chamber. Journalled in four main bearings 27, that are formed ina crank case 28 is a crank shaft 29,.rthe axis of ,which intersects the parallel axes of the six cylinders in 'block'10' and said crank shaft is provided with three cranks, 30,

31*and 32, that are disposed 120 apart.

7 'Grank 30 is located in line with chambers 11 and 12, crank 31,

in line with chambers 13 and 14', and-crank'32 is in line with chambers 1"5and16. 1 Q

Each crank throw ofv the crank shaft is provided with two finished bearing peripheries, such as 33 that-are engaged by the connecting rods to'the pistons in the respective chambers and securedtocthe central portion of each crank throwl,between the connecting l rod beari gfaces thereonis 'a-counterbalanciii-g weight Each'of'these counterbalancing" weights projects diametricallytopposite tothe radial planeoccupied by the crank to which it is connected and thus the three apart, circumfery "Straight diameter-pistons, such as 35 are arranged for 1 operation within combustion 18 or 1 9, 016 increased diameter, and all of the si'x pistonsare connectedto crankthrcws by connecting rods 36.

Arrangeden one suchas- 39, the axes of i I bustion chamber 14:,is

similar transfer duct 53 that leads from the gaseousfuel outlet ports from pumping the correspond ing bearing peripheries 33 on the respective i cylinders I w n V 7 side ofblock- 1O and' dipiston valves functionasthree unitsand that frectly opposite chambers 12,14 and 16 are pis ton valve'cylinders, which are parallel withthe axes of the engine cylinders and'arranged for operation within each cylinder 39 is a piston valve, such as 40. All of these piston 'valvesare connected to an auxiliary or eccentric shaft 41 by connecting rods, such as 12 and'said auxiliary,

shaft, Which-is mounted for rotation in suitable bearings, is driven'directly from'and at the samecra'nk speed of crank shaft 29, pref such as 43.

Formed through the upper portion of the Wall of each valve cylinder 39 is a gaseous erably by means of conjoined gear wheels,

fuel inlet port 1 1, which may be connected'to 1 a suitable source of supply such-as a carburetor and leading fromethe upper end of the so Q chamber in'each valve cylinder to'the upper portion of the annular gaseous fuel inlet duct ()n'the oppositeside of exhaust ports 46 leadfrom the intermediate portions of combustion chambers 11, 13, and 15, said ports being so that they are uncovere ends of their strokes. I 4 'Formedin the walls ofblock 1O that'surblock 10' fromthe disposed p and open, only when the pistons 35 are at "thelower or outer.

pumping chamber of, 1 r the adjacent two diameter cylinder is a short,

round the intermediate transfer portions of I COHlbUStlOIl chambers 12, 14 and 16 arev annu lar gaseous fuel transfer chambers 47 and leading therefrom mto sald combustion chamgaseous fuel inlet ports V here 12, 14; and 16, are 48. These ports are disposed so that they are uncoveredand open only when the pistons 37 that operate inthe chambers 12, 1d

and 16 are at the outer or lower ends of their strokes; y V

- Leading from the upper portions of the nular pumping chambers 17 1'8 andj19, are

gaseous fuel outlet ports, -such"as.49 andl'eading from the outlet portthat leadsvfrom chamber 17 to an inlet port 50 that communi cates with the transfer chamber 47 that 'sur- 7 rounds combustion chamber16, is a transfer. 3

Y V l duct 51.

Leading fromlpumping from the outlet ports that lead chamber 18, tothe inlet port 50, of transfer chamber 47 that surrounds combustion chamber12. y -For a more comprehensive understanding chamber 19 to theinl et port 50, v, i intoannul ar chamber 47 that surrounds com-I a transfer duct 52 and on the upward or inward stroke of each in the corresponding chamber 17 ,1 18 or 19 and passes therefrom through the corresponding transfer'ductto the corresponding one of the annular chambers 47 and the combustion chambers thatare surrounded thereby. 7

.As each piston valve moves through the lower half of its downward stroke and through the first half of its upward stroke, piston 37 in theadjacent and associated engine cylinder, is moving downward thereby inducting into the corresponding annular chamber, for instance 17, through open inlet port 44, piston valve chamber and duct a charge of gaseous fuel-and, on the following upward stroke'of piston 37, this charge of 1 gaseous fuelwill be forced under pressure from chamber 17 out through port 49, through duct 51 and port 50, into chamber 47 that surrounds combustion chamber 16.

In like manner, gaseous fuel is pumped from chamber 19 through duct 52 to chamber '47 surrounding combustion chamber 14, and gaseous fuel pumped from chamber'18passes pass through common clearance chamber 21.

and thence downwardly chamber. 11,

The charge of fresh gaseous fuel thus pumped into connected chambers 11 and 12 will drive before it the burnt gases and prodthrough combustion nets of combustion resulting from the pre-v viously ignited fuel charge and said burnt gases will be forced out through the exhaust port 46 that leads from chamber 11, after' the pistons 35 and 37 have moveda short distance upward or inwardly, ports 46 and 48 will be covered and closed and during the continued upward'or inward travel of said pistons, the admitted fuel charge will be compressed within the upper portions of chambers 11 and 12 and within common clearance chamber 21. At the point of highest compression or as the pistons pass high center, the compressed fuel charge will be simultaneously ignited. at two. different points within chamber 21 by sparks produced between the inner ends of the electrodes of plugs 26, and the abrupt rise in- .pressure following combustion of the compressed fuelcharge will be directed against the heads of pistons 35 and 37 to drive the same downward on their power stroke.

It will be understood that the operations just described take place within the, connected pairs of cylinders 13 and 14 and, 15 and 16, and, as thereare three units toj the engine, and the threecrank throws to which the pairs of pistons are connectedare dis-1% posed 120 apart there will be three power impulses imparted to the crank shaft during 1 each revolution thereof.

' The piston valves 4O operate in proper time relation to the. combined power and compression pistons with which they are-associated and the symmetrical disposition of the three throws of the crank shaft and the counterbalancing of each throw, tends to eliminate vibration and insures reciprocatory. and rotary balance.

Obviously, minor changes in the size, form and constructionof'the various partsof my improved internal combustion engine may be made and substituted forthose'herein described without departing from the'spiritjof the invention, the scope of which is set forth in the appended claim. I claim as my invention: 7

In a two stroke cycle internal combustion engine, the combination of six cylinders arranged with their axes parallel and centered on a line and in a row parallel with the axis of the enginecrankshaft, three of'the six cylinders having straight diameter, theother cylinders being arranged in' three pairs. with one straight diameter bore and onetwo dlameter bore cylinder being disposed adjacent. each other'and comprlsing one pair, as'ingle cylinders of the 'two diameter form, thesix compression and combustion clearance cham- Y ber-joining each pair of cylinders as acornmon clearance chamber to both, a three throw crank shaft mounted in fourmain bearings, acrank throw-between each pair of main bearings, the three throws of the crankshaft being disposed 120 apart, there being two I connecting rod bearing faces on each of the three crank throws. of said crank shaft, a counter balance weight arranged centrally between the two crank bearing faces of each of the three crank [throws and suspended diametrically opposite the aXe-s of the said crank throws, an auxiliary shaft, three p-is-- ton valves directly connected tosaid auxiliary shaft, said auxiliary shaft being driven at engine crank shaft speed, the three piston valves arranged with the axes of their respective bores substantially parallel with the axes of the main" cylinders and arranged in a row centered on-a lineparallel with'the axis of saidauxiliary shaft, i

one piston valve being disposed directly adjacent to each of the main cylinders having" the two diameter bore and functioning as an.

admission valve to the annular. spacefcreated between the stepped diameters of the two diameter cylinder and its respective two diameter piston, eachpistonvalve chamber being provided with a gaseous fuel supply a short distance below its head end where said port is fully open only when the correspond- 4 ing piston valve is at the-lower end of its Seem, theneheifmg'eii imlet'pbrt teaiiiimrg'firom the extxreneeheada endi ofi'eaetmipisten. valve. chamber into the extreme iiplpven' enidi ofi tlzue:

chamber 04% larger 'clfiianieten-imz theemme spending two diameter pmnpimg cylindegx said; inlet port being- 11isposed ccdamjetrieal ly opposite tothe outlet portzthamlcmdeifinem the chamber of l'mrgen dizmi'eteriofi seict twe diam eter pumping cha'mber a detachable cyli nder head havingthree common cemp ressieim and cemthsti'on eleaamnce ehspm bei s arranged and l'e'cateci 50* as to join: the respective mem bers of the three pairs Gwynne-ens, a pwirot ignition devices seated inthe engine cylinder head endlp-rojeetin-g inteacemme-r cle'wi anee spagce, eneignitien device-beinglocatect'zvbeme each GYIIQI-dQT; exhaust ports termed 1n the wall? c-f each of the eti aigltt diameter cyi i-n dens, inlet ports; formed in the; wall oi? the smelter diameter portion. eff each oi the two d i'aimetencylinders, inlet a-ndi eutbetv ports! i formed. in the head of thelarger diameter EVERETT 11'. URN T. i 

